New jeesey



Dec. 7 1926. 1,609,7$

N. w. PERKINS OVERDRAFT KEY LOCKING MECHANISM FOR CALCULATING MACHINES Filed March 25, 1926 2 Sheets-Sheet 1 Dec. 7, 1926. 1,609,768

N. w. PERKINS OVERDRAFT KEY LOCKING MECHANISM FOR CALCULATING MACHINES Filed March 25. 1926 2 Sheets-Sheet 2 unrreu sm'res PATENT OFFICE.-

W. FEEIRXHTS, Q13 HEWARIC, NEW JERSEY, A SSIGNOR '10 ELLIS ADDING' PT M951 Y, i)?! NEWARK, NEW JERSEY, A CORPORATION OF NEW i'JtTK SIUJiIi-EAFT MECHANISM FOR CALCULATING MACH INEB.

llnpiication flied March 23, 1826. Serial No. 96,735.

inuention relates to overdraft key mecluinism 'orv calculating Ins- -u air-er a subtracting operation to Wit, a negative amount.

eposinnrs uccouni s in hanks constitute work wherein such a, notification iortaut a so an account wherein i checks exceeds the total of overdrswn.

. negative amount, the true negative I lore, to notify the op u hins that negative amount contained in the accumulator, e operator to so operaive the mait will print the negative amount .rdraiit and. not the complement thercoi. is patent F W, iiernsu, No. 1,5082%, oer ll, lilf l. and appli ation Serial. i @1535, filediictohcr ill, 1922., of which patent is a division, forth mechaicl: will automatically notify the opion an o vcrdrau or negative amount n'ltaineil in. the accumulation llne u :hunism conien'zplaies the autoand subtotal kelxjs 'ie when on oi'r-i'dru i mdition u: when the opernior a, lRPiS to l or Sillhilflidl he his 'o do so notifies him that an over l procem 3 in release. the automatic means so that the comoverdrnit amount may he ".iihif-Z in the sccnnnilntor. The op.

overdraft mechanism, but, also, I provide 'mechanism by which the operator may con;

tinue to perform additions in the accumulator, after saidv key or keys have been locked, until the negative amount in the accumulator has beenconverted into a positive amount,

My improvements, therefore, accomplish the result obtained by the Bernau mechanism and the further result of enabling the operator to bring about a positive result in the accumulator, by further addition, for the purpose of unlocking the total and sub-total eys which have previously been lockedby the overdraft condition of the machine.

The present mechanism, like the Bernau mechanism referred to, is particularly adapted for use in connection with the adding and subtracting accumulator of the Ellis machine, such accumulator being set forth in patent to Halcolm Ellis, mechanical calculator, No. 1,203,863, November '7, 1916.

It will be understood,-however, that the present improvements and the principles involved therein are not. necessarily, restricted to embodiment in mechanism similar to that of the Ellis machine as these improve- Inoni's may be used in other calculating machines and the claims are to be understood as coverin any improvements involving the principles of the invention in whatever calculat-ing' machine they may be employed.

The present improvements being ndditional to the mechanism of the Ellis machine and "to the adding and subtracting accumu later set forth in the Ellis Patent. No. 1,203,863, reference is to he had to said Ellis patent for a full disclosure of such mochanisms, related to the present improvements, and cooperating directly or indirectly therewith, are notfuily illustrated and de scribed herein.

The preferred embodiment of the invention is hereinafter described and shown in the accompanying drawings but it is obvious that the principle involved may he carried out by the use of modified mechanism.

In the accompanying drawings: v

Figure l is a detail section on the. line 1-2,

l iguro 4, through the shift liar, accumulator shaft. and other shafts of the accumulator of the Ellis Patent 1.203.863, showing my improvements applied thereto. the adding hook and certain other parts of the Ellis accumuleior being omitted for the sake of clearziess, the subtracting aris being in normal position;

F 2, is o similar View, the parts being in the positions assumed when passin zero in a subtracting operation;

Figure 3 is a similar View on the line 3-3, Figure 4: the subtracting hook, shift liar and certain other poiis being omitted for The sake of cleiii'ness, the adding parts appearing in full lines in their normal position and in ofted lines when passing zero in an mhiing operation;

Figure is a roar elevation lOOlilTig isowa sii the le'fi; of Figure 1., certain parts being omitted fo the sake of cleaz'iiess; and

Figure 5 a peispective View showing tho iiOiZfil and subkohil keys, the locking mes; therefor, and opeizii ive connections controlled by the accumulator has also the manually operated means for releasing the key locks; the li'ome of tho i'noohine and the accumulator being entirely omitted for ihe sake of cleoriiess.

'iheoticling end subtracting fiCcilil'lllll lfll illustmted embodying the principle involi ei'l in he Ellis occmiiiilatoz' forth in Patent 1303,8655, and the general nature and ohjeut of on automatic ove iizi total and siih-toiel my locking iiiechzinism having been 'fm'ih fully in the Beiiuiu Patent No. 1,508,267, reference will he made only to such iiiechoiiisms as should be described (0 show the construction, operation, and results obtained by my mechanism. No numeral keys are shown nor any controlling keys other than the io-- ml key and the so s-total key K64, ihese hitter keys being the only ones with which the present invention is concerned.

The kevs Kfiii KM, may he, as set forth in the Ellis and patents, latched, when depressed by latches L56 end 56L, but these latches oonstiinte no part of the present iiivention.'

The keys K63 and lii-l have a notch a. Pivoted latches ML and 68L are provided with offsets or lugs lG'YL whi h are adapted to enter the nol'ohes (.4 for the purpose of locking the keys K63, K64 to prevent said keys from being depressed.

The latches 67L, 65433, normally are free of the notches a hut when. the mechanism of the present invention opemes on the occurrence of on overdraft in the ilCCllIilllliltOl, that is. when the lOSllli' becomes less than zero n-itoi' a snhirnctingr operation pei'fi'irmeil on the acciimiiloi i, the iziiehes 67L, (38L are iziovoii (0 cause theii' lugs 167i to enler the ooiohos a and prevent he keys K63, K64 from being depressed, (.onseqiiontl n ii a negative amount or result is sot up in iho am-iimiihitor having the wheels N50, the keys K63 K641, will he miloinii'iivzilly loilieil. When the operator seeks to depress one of said koys :iml limls that tho key connotbo set he is thus shi'fzebie hair 66L is giiioecl b3 .i

a i, A 12$. 11 spring Wllitll suitably choreal and ll'1&lLiliL&lEl-3(l ionizer tension 03;

'ihe machine which has iliitliailj, extenqliz or prmechons ca (1. The coo ieiioii Oi ihe fingers o, (Z, Willi iiiechaiizsm now i';o ho ile scribed, results in a i'oelzih iillfi shaft Ni and the operoiion of the hitches ililfi, Whlfiih in form unlocks or looks the keys liGI-L K64.

Referring to Figures: 1 2 and 3,. illusi'iohiil only ii e left ham? or high: {lea' of accumulator Wheel N50 (is is i Wheel of the high si order of the series 0 wheels of ihe :ioeuiiiuletor which is util'flofi ,IBOFLQG'Y. to operate the overdraft key ing mechanism. ltfwill he omiei'stooil the occiimuloior of lhe maehiiio will con '21s man of the accumulator Wheels N56 required by a number oi hanks o of numeral keys.

No disclosure is iiioilo of the 'plaie 1.203.863) whi :h comprise a port of the oceuiiiiilatoi" with which my iin ir-rivemenis eomhiiieil and )ZiffPE'QllCfi is to he hail in that conneiition, lo the Ellis potent as 51 showingof these pris "Woiiid render less clear i'ho pii'tieulm' improvemeiiis i'egireseoteil my the present invention.

The Wheel iJSO has ii coin N56 PiOVlfiiQil wih diametrically opposed points, the eom being; seoiiietl i'o sihe "have of the Wheel by i'ivel s N'lO.

The adding hook appears at Niil anti siihl'z-iizfin z hook is shown iii, N62. points of these hooks are adapted to so operate with iho points of the cam N56.

The shift 1721' N90 adopted to he iiii-ii through :1 limited mimliei' of degrees he so? the sliding and suhiz'iieiiing hooks oi the ELF ouiimloioi' so thin: he iieeuiniiloioi' ho UStKlQ-llhm' i'oi' oiiililioii or subtraction, as oxplziiiioi'l in i'hcaforesaid Ellis paioiiii. Springs N84) i'oo ieiziie \Vlill the hooks Nil N62, respectively so as in tend to him then: to bring their poinis in position for engagement by the, points on the com T556 Setting of {he shii'i l'mi' KW Goieimiiieq which sol or psi s of bucks wi l "be frse i cpemic :imi. which will b3? blocked Tifhc which cs1- wiwcis rippcsrs at .J adding and subh-actinv I a siimi'n st v p csecli impmvcmcms ms mic is die accunmiamrmechanism and. their principic is net modify 1e accumulator mechanism bui; utilize it. for time purpcss cf lacking tbs total and sub-total keys K68, K64, when the Whsci. N50 of ihc hz'gihcsfi crder of the accumuiai'or While tuning in the dicectiun indicated by the snow, Figure 1, cssses mpoint mi-ihc exam to engage and depress the subtracting hock N6EE'duca. subtracting; apex-Mimi which brings shim? a fesuitlcss than zem.

My invention also concsmpisccs the pa vision {9f improvements by which, 011 adding: into the accumulator an smc uni; which wili rsstcrs' m" ccm'crt s ncgmfi fe result P!"Qi"imisly sci; up on he accumulator, m s. 3-O31- tivs i'csuit 21 summit. the lacking mcchw nism for the total and subtctsi keys K64 will be restored its normai. PGSiiIIOB;

thereby smacking said keys.

With these ends in View, I prs ids an whisking arm UN Figure-s l and 2, return arm N57, Figure 3 mounted sicisby side (in s c061 N7. The acicusting arm 711*? is drawn in clockwise direction, when free, by a, swing SUN which is connected m i; and is suiiabiy anchored sdthat it wiii. can; stantiy smut tcnsirm on said ac'niatin'g mm. The rcium arm N1? is, in like Hummer, ucmated by m'm spring 811? whose, mnciency is to cum His said arm N5? a clock 'Wisx- Erection scmaiailg arm 71 is; um'msiiy atc'ieni by a 112;: mwrcjcctlcn Y on t; subhocL N62 shown in Figum 1'. but c subt "acting: hnok is named. 1mm msi pcsii'icn by His cngagsmc'nt thczcone of His poinfs on the cam N56, 01" pmjcciimi Y is ccicsscd fmizi isiing arm TiN and ihcrcupmx, time ups the actuating mm 711% in 5;} s pnsiigion shown in Figz'm'c 2 the moccmsni; oi the aciiuating :n'm being m'rc tsai in any snitmbis mamicig for insi'snce, by; the rod 02: siccv-s N which is csx'risci by the Emma 0% HM: mac-him.

aciiimbicg arm 711$ in the manner forth rcsulfs in a projection a 01 the mid arm cnsngzins: the lug 5c projcction c of the arm GGN. The shaft N6 is flicz'sby imimcdintci turned, the arm N68 is x'cckcci in i'hc direction 01% thew-From Figure 5 and thc inn 66L and iink (39L at once swings ('11s lsiichcs 67L, 68L so that theii' projccticns 16H. enter the notches a on the total and sub-mini keys KS3, H6 Saidkcys are thus locked when an sic-Tr; aft c'onditicn is brought about during sub I and su ii icmi keys 113.51 Wiih flis .iug; 01: pm we Wiicn the return m n E5? rciscscm release is by the sni; sf

of tile pcin ts 0'3? the cam ivlci-i. the anti. Eng hack N61 on ii'li turning; of t me W31 N of the iiigilzesfi nrcier in 2i cmmtsrcicc wise direction, that is, is a iii'sctimm applisitc f0- the direction indicated by the gm'cw, Figure 1.v

Canssqucniiy, i cm'c as prcvic us fruiting arm subtracting hook Shawn m Fig. 2AM operator in irclessc mm? snci si mm keys K63, 34. which Emits-(i by opcmi' the numcirsi keys of ii) chine to such extent that the f lms negative smmmnh Wiii m QOIlK Giilfli positive amcum; cn communist-m.

Whcii *this is Zane iii-2 wines; mi tuming in a cmmtercisckwisc direciicn, t1 adding hook N61, brim, it ts the diotteii Kins positicn shswzi in Figure 5- whet-9113mm tins pmjscticn X clears the pr jecticn f. The spring 811? film: snaps ihc i'cihucn mm N52} causing the pmjeciicn to cm; time pzcjsction (5 cf the arm if-AL thus is the 21m firm; the aim-ted? Zinc pcsi' the i'uii i-im pcsitisn ii ig m'c This? Z1. reversal cf pas-minim which pus hc-s on ihc Bin bar 261D m swing the 1m isms than 5mm the mic-n l crcicz' (has 1552s L K63, K54, mayus si -nus s1 cmrahsfk, 1 1; i Bci'nzm Wiim'ciy u chine can c mnnipui Thc ssh iini; engaged z in suitsbic bearings 01': the machine f2 Thc arm fast 011 the snsfil i is in?! mg i to wipe against the arm 1W8 when The dccfma} siicis P6? is moves? in His flux zirm'w. Figmc 2 iims iaiciics 67L 68L 5mm tom} keys Kfifh T H10 cicciiwal siicic i 1 c i EH15 Psici'ii; #19:;254...

'Hii

. key, said actuating member being adapteai drqi't; is canceil aiu r ,to shift the rocker t0 cause aha iatter to 111 testimany Whereef i 1 3.5 5:

1 operating key when an oversimft occurs *NATELAN W EREZ' latching hooks are operated by the accuin the accumulatp'r, zmfl mulatnr, and a rockably moupted arm bar 'bBjDggfldfiQtQd w a adapted to operate the keydockmg means opposite dzrectlon. re

either to lock the key or to unlock said means to Qsrmali wndiitien operate, the keydocking means to lock the 

